modular construction for energy efficient, affordable housingmodular passive house enclosure details...
TRANSCRIPT
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BCBEC AGM
November 06, 2019
Modular Construction
for Energy Efficient,
Affordable Housing
Elyse Henderson | MSc, CMVP, LEED Green Associate
Energy & Sustainability Analyst
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2
Prefabrication,
Modular Construction
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Mandate:
fast, affordable,
sustainable housing
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How can we meet our mandate?
FAST: Rapid Response to Homelessness (BC Housing)
AFFORDABLE: Housing for those in greatest need & community
housing sustainability (CMHC-NHS)
SUSTAINBLE: Sustainable housing and communities (CMHC-NHS);
BC Energy Step Code (BC Housing)
Also, housing for underserved communities (CMHC-NHS):
Northern housing
Indigenous housing
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Solution – Modular Construction?
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Case Studies
Bella Bella, BC
Remote location
Wet climate
Passive House
Abbotsford, BC
Timeline
Step Code targets
Considerations for overheating
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Case Study #1: Bella Bella Staff Housing
7Case Study #1: Bella Bella Staff Housing
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Project Overview
Owner/Operator: Vancouver
Coastal Health Authority
Building type: 6-unit staff
accommodations
Location: Bella Bella, BC
Construction year: 2015
Manufacturer/Builder:
Britco/Spani Developments
Energy Target: Passive House
8Case Study #1: Bella Bella Staff Housing
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Heiltsuk First Nation
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Apartment fire in 2014
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Challenges
6 month timeline
Wet coastal British Columbia
weather
First Passive House project for
the design team & construction
team
Remote site with limited access,
labour, and materials
11Case Study #1: Bella Bella Staff Housing
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Bella Bella
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Vision: first fully modular
Passive House
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Remote location… Where do you find
Passive House Labour? Materials?
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Solution: off-site
construction
Clean, dry,
accessible
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Train the trades
for Passive House
in off-site factory
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Air barrier details: especially important
for Passive House certification
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Mid-construction airtightness test?
Construction time is only 1-2 days on site
So when do you test?
Exterior insulation and cladding is complete prior to arriving on site
So how would you fix any issues?
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Solution: make each module airtight!
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Another
Challenge…
Modular Passive House
enclosure details
R-40 walls with 6” exterior
insulation
Critical barriers are at the
sheathing
need to access that connection
Also, all details need to be
finalized before
manufacturing begins
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Foundation and site prep work is done
during manufacturing & shipping
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Modules protected on all 6 sides
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Done! 6-Plex Staff Housing
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Lessons Learned
Stacked boxes inspire concise
form factor – helps TEDI
Factory production requires
detailed drawings sooner
Site labour & shipping savings
exceed Passive House costs
Community was happy with the
short disruption
The project has been
replicated!
34Case Study #1: Bella Bella Staff Housing
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Case Study #2: Abbotsford Shelter
35
Case Study #2: Abbotsford Temporary Homeless ShelterImage provided by Metric Modular
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Project Overview
Owner: City of Abbotsford
Operator: Lookout Housing
and Health Society
Building type: Temporary
Transitional Housing
Location: Abbotsford, BC
Construction year: 2019
Manufacturer/Builder: Metric
Modular
Energy Target: Step 3
36Case Study #1: Bella Bella Staff Housing
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Challenges
Fast project timeline to provide
temporary transitional housing
Stringent overheating
requirements
Step Code energy targets
37
Case Study #2: Abbotsford Temporary Homeless Shelter
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BC Energy Step Code
Performance Based Metrics
Whole Building: 2.0 l/s-m² @ 75 Pa
Suites: 1.2 L/s-m² @ 50 Pa
30 kWh/m²/yrSTEP 3 120 kWh/m²/yr
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Design Strategy
Heat recovery ventilation: in all suites and common spaces
70% SRE
Wall assemblies: split insulated wood frame
1.5” exterior mineral wool or 1” XPS
Window performance: double glazed with vinyl frames
U-value of 0.26 Btu/(hr-F-ft²), SHGC 0.3
Airtightness: target per modelling guidelines & BC Housing
39Case Study #2: Abbotsford Temporary Homeless Shelter
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• Simple form factor
• Small suites
Energy Modelling
Walls and Roof Infiltration Windows Ventilation/HVAC
TEDI (Step 3
requirement)
0 5 10 15 20 25 30
kW
h/m
²kW
h/m
²
kWh/m²/yr
Case Study #2: Abbotsford Temporary Homeless Shelter
Lights
Plug Loads
Heating
Cooling
Fans DHW Misc.
TEUI (Step 3
requirement)
0 20 40 60 80 100 120 140
kWh/m²/yr
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Considerations for Overheating
41
0
100
200
300
400
500
600
700
800
900
80-85 85+ All hours greater
than 80
Num
ber o
f H
ours p
er Y
ear
Space Temperature DB °F
Level 3 - West Suite No Blinds Blackout Blinds
Overhangs Side Fins
Cooling in ERVs
Limit (200 hours total)
26°C – 30°C +30°C All hours greater
than 26°C
Case Study #2: Abbotsford Temporary Homeless Shelter
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Typical Project Timelines
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Lessons Learned
Engage early with local
jurisdictions to facilitate
permitting
Energy analysis helps guide the
design approach
Consider overheating in design
– mechanical cooling may be
necessary
Temporary housing can still be
energy efficient and airtight!
43
Case Study #2: Abbotsford Temporary Homeless Shelter
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How can we meet our mandate?
FAST: 6 month project timelines
AFFORDABLE: provides basic housing needs
SUSTAINBLE: Passive House & Step Code
Also, housing for underserved communities:
Solution for remote locations
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Iqaluit – steel framed modular
45
Where
next?
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Learn more at
MODULAR CONSTRUCTION FOR ENERGY EFFICIENT,
AFFORDABLE HOUSING
@RDHBuildings
RDH Building Science
Discussion
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